VMS Help MACRO, VAX MACRO Assembler, Directives, .G FLOATING  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Evaluates the  specified  floating-point  constants  and  stores
    the results  in  the object module.  .G_FLOATING generates 64-bit
    data (1 bit of sign, 11 bits of exponent, and 52 bits of fraction).

      .G_FLOATING literal-list

    literal-list

    A list of floating-point constants.  The constants cannot contain
    any unary or binary operators except unary plus or unary minus.

    G_floating-point numbers are always rounded.  They are  not
    affected by the .ENABLE TRUNCATION directive.

    The floating-point constants in the literal list must not be
    preceded by the floating-point operator (^F).